var ajax = function(){
	var xmlhttp = false;
	try{
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e){
		try{
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch (E){
			xmlhttp = false;
		}
	}
	if(!xmlhttp && typeof XMLHttpRequest!='undefined'){
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}